//
/***********************************************************
             File name:      main.c
             Author:         Bitat (陆叁柒)
             Email :         Bitat@qq.com
             Gitee :         https://gitee.com/bitat
             CSDN  :         https://blog.csdn.net/bitat 
             History:        2023/2/8
************************************************************/
    

#include <stdio.h>

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;
    while(scanf("%d%d%d",&a,&b,&c) != EOF)
    {
        if(a + b > c && a + c > b && b + c > a)
        {
            if(a == b && b == c)
            {
                printf("Equilateral triangle!\n");
            }
            else if (a == b || a == c || b == c)
            {
                printf("Isosceles triangle!\n");
            }
            else
            {
                printf("Ordinary triangle!\n");
            }
        }
        else
        {
            printf("Not a triangle!\n");
        }
    }
    return 0;
}

